How to Replace or Fix a Transmission Oil Pan or Gasket Leak

UPDATE: July 2, 2020 A limited supply of original Lextreme parts back in stock including EGR Delete Kits, torque converters, supercharger brackets, etc! Please note that the SC400 turbo kit is all sold out and won't return. Email me at [email protected] which original Lextreme parts you need and I'll check availability. (Please note that we're not an auto parts supplier.)

LEXTREME LEXUS FORUMS HERE! - Post Questions Here For Quick Answers!

This is something very simple to fix but its also a pain when you go to your friend’s house and park at their driveway and leave some oil marks.  Its an embarrassment but this need to be fix.  Otherwise your friend would never want to invite you back again.  This fix can be done for about 30 minutes with basic tools.


  • 14 mm wrench
  • 10 mm socket
  • Razor blade
  • De-greaser


  • Transmission Oil (2.5 quarts)
  • Transmission Oil pan gasket

The best way to attach this task it to jack the car up on the rear driver side with tire chocks in the front tires.  Once the car is jacked up, then u should put in a jack stand for safety.

The easiest way to loosen the drain and the filler plug is coming into the car from the center.  The first thing is to use a 14 mm wrench and loosen it counter-clock-wise to drain the oil transmission oil.  Once the plug is loosen and the oil is drained, let it seat for about 15 minutes.

  • Now The Filler Plug should be loosen first for ventilation when the oil is drained.  The first picture below is the Filler Plug and the last two pictures are Drain Plug with an allen wrench. (Right Picture Below)
  • Now you can use a 10 mm socket to loosen all the screws holding the transmission oil pan.  Hint:  Make sure you have two screw on both sides of the pan so the pan just don’t fall right off.  (Left Picture Below)
  • Once all the screws are loosen, the oil pan might not come off.  Its best to use a small hammer or mallet lightly tap the side of the pan to loosen up all the old grease.

  • Once the pan comes off, it most likely will be torn.  Its also a great time to replace the gasket at the same time.
  • When you take out the transmission oil pan, portion of the dipstick shaft will comes along.  Just slightly give it a pull and it will come off.
  • Now you can use a razor blade to scrap out the old/torn gasket.  Make sure you clean out all the residuals gasket in both the transmission body and the transmission oil pan
  • Once all the debris are off, you can also spray some de-greaser to clean out the pan and body.

  • Once the pan is ready to install, its best to mate the dipstick shaft first and crew all the those 10 mm back
  • Once the pan is stalled and tighten, its time to screw the drain plug back
  • The final inspection on the transmission oil pan is ok, then its time to fill the transmission oil from the top.
  • From my personal experience, 2.5 quarts is about right but make sure you double check it with the dipstick and have the engine run for a while and measure it while the engine is on.

Do you have any questions? If so, please head over to the forums to get a quick answer or share your experience!

This is a freelance site with no support by huge companies.  I have been doing most of the R&D and technical write-ups by myself with my personal money and literally thousands of hours of my time.  I have taken extra steps to demonstrate in details how things are done.  Currently I am one of the few people doing Lexus V8 research and performance enhancement.  This effort comes from my personal love for this wonderful engine.  Most of the modifications are from trial and error. There's no cookbook for 1UZFE mods and its unknown territory for much of supercharger performance.  The parts, labor, web development and site hosting are 100% paid from my personal hobby money.  If you feel my efforts help you in any form, please do not hesitate to donate any amount of money to support this site. You have no idea how much I and the entire Lexus and Toyota community appreciate it!

Leave a Reply

Your email address will not be published. Required fields are marked *